Spectral separation filters for 3D stereoscopic D-cinema presentation
AssigneeDolby Laboratories Licensing Corporation
InventorsMartin John Richards, Gary D. Gomes
Life of this patent
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Abstract
Spectral separation filters for channels of a 3D image projection incorporate passbands of primary colors. In at least one of the filters, passbands are present in more than 3 primary colors. A set of two filters include a first filter having passbands of low blue, high blue, low green, high green, and red, and a second filter having passbands of blue, green, and red. The additional primary passbands of the first filter allow for an increased color space in projections through the filters compared to filters only having red, green, and blue primaries. The added flexibility of the increased color space is utilized to more closely match a color space and white point of a projector in which the filters are used.
Claims41
A projector filter, comprising:
- a first filter having a first set of primary passbands;
- and
- a second filter having a second set of primary passbands;
- wherein:
- the first set of primary passbands has a different number of primary passbands than the second filter;
- and
- the first filter has at least two blue primary passbands and the second filter has at least one blue primary passband.
A projector filter, comprising:
- a first filter having a first set of primary passbands;
- and
- a second filter having a second set of primary passbands;
- wherein:
- the first set of primary passbands has a different number of primary passbands than the second filter;
- and
- the first filter has at least two green primary passbands and the second filter has at least one green primary.
A projector filter, comprising:
- a first filter having a first set of primary passbands;
- and
- a second filter having a second set of primary passbands;
- wherein:
- the first set of primary passbands has a different number of primary passbands than the second filter;
- and
- the first filter has two blue primaries and two green primaries and the second filter has one blue primary and one green primary.
A projector filter, comprising:
- a first filter having a first set of primary passbands;
- and
- a second filter having a second set of primary passbands;
- wherein:
- the first set of primary passbands has a different number of primary passbands than the second filter;
- and
- the first filter has passband wavelengths of approximately 400 to 440 nm and 484 to 498 nm, 514 to 528 nm, 567 to 581 nm, and 610 to 623 nm.
A projector filter, comprising:
- a first filter having a first set of primary passbands;
- and
- a second filter having a second set of primary passbands;
- wherein:
- the first set of primary passbands has a different number of primary passbands than the second filter;
- and
- the projector color space is the color space of a D-Cinema projector.
A projector filter, comprising:
- a first filter having a first set of primary passbands;
- and
- a second filter having a second set of primary passbands;
- wherein:
- the first set of primary passbands has a different number of primary passbands than the second filter;
- and
- the projector filter is an electronically switchable filter that switches between the first and second filters according to an image synchronization signal.
A system for projection of spectrally separated 3D images, comprising:
- a projection system configured to project left and right channel images for display by a viewer;
- a filter placed in at least one light path of the projection system comprising a left channel filter and a right channel filter;
- wherein at least one of the left and right channel filters has more than 3 primary passbands.
A pair of projector spectral separation filters configured to divide a blue projector primary into three sub-parts, a green projector primary into three sub-parts, and a red projector primary into to two sub-parts.
A color filter set, comprising:
- a first filter having a first set of primary color passbands;
- a second filter having a second set of primary color passbands of different wavelengths compared to the first set of primary colors;
- wherein:
- the first filter has more than one primary color in at least one color band;
- and
- the filter set is embodied in an electronically switchable filter set.
A color filter set, comprising:
- a first filter having a first set of primary color passbands;
- a second filter having a second set of primary color passbands of different wavelengths compared to the first set of primary colors;
- wherein:
- the first filter has more than one primary color in at least one color band;
- and
- the color filter set is part of a 3D projection system and the primary passbands of the first and second filters are selected to maximize reproduction of a color space of the 3D projection system without the first and second filters.
A method, comprising the step of:
- preparing a 3D image comprising a left image and a right image;
- filtering the left image with a left channel filter;
- filtering the right image with a right channel filter;
- and
- projecting the left and right filtered images onto a screen;
- wherein at least one of the left channel filter and right channel filter have more than 3 primary passbands.
A filter system, comprising,
- a first set of filters comprising a first set of optical passbands;
- a second set of filters comprising a second set of optical passbands different from the first set of optical passbands and encompassing the first set of optical passbands.
A method, comprising the steps of:
- providing a theater audience with a pair of 3D viewing glasses comprising left and right lenses respectively comprising left and right viewing filters;
- and
- projecting left and right images onto a display screen using left and right projection filters;
- wherein the left projection filter and the left viewing filter comprise a first set of filters having unequal passbands and the right projection filter and the right viewing filter comprise a second set of filters having unequal passbands.
Dependencies are inferred from the claim text.